F#madd9 is F#, A, C# and G# — F#m with the ninth added, and no seventh.
It sounds sharp-edged. The ninth grinding a whole step under the minor third is the edge an m9 softens.

| F# | A | C# | G# |
|---|---|---|---|
| 1 | ♭3 | 5 | 9 |
Minor tonic — a triad with one colour on it.
Also written F#m(add9), F#min(add9) or F#-add9. The same chord either way; which spelling you meet depends on who wrote the chart.
Take the four notes stacked as close together as they go, then drop the second voice from the top an octave. The gap it opens is what makes the chord sound like a chord rather than a cluster.
It lands on four adjacent strings, which is why it is the workhorse voicing on guitar.
F#madd9 has 12 of them, on the top four strings, the bottom four strings and the middle four strings, from open position up to the 11th — every inversion the chord has: F# in the bass, A in the bass, C# in the bass and G# in the bass. The one to learn first is the F# shape at the 2nd fret, which is the easiest grip here.
4 of them sit on the top four strings, so you can run the inversions up one set without changing strings — which is the whole reason to learn them as a family rather than as separate grips.
Start with xx4224 — no barre and down at the nut. None of the shapes for F#madd9 uses an open string, so every one of them is movable; the lowest sits at the 2nd fret. 2 of the 7 need a barre. Together they cover the neck from the 2nd fret to the 14th.
| Frets | Where | Bass | Top | Hand |
|---|---|---|---|---|
| 244224 | 2nd fret | F#, root position | G# | barred |
| xx4224 | 2nd fret | F#, root position | G# | all fretted |
| xx7674 | 4th fret | A, 1st inversion | G# | all fretted |
| x9769x | 6th fret | F#, root position | G# | all fretted |
| x97x99 | 7th fret | F#, root position | C# | barred |
| x-12-11-11-9-x | 9th fret | A, 1st inversion | G# | all fretted |
| 14-12-x-13-14-x | 12th fret | F#, root position | C# | all fretted |
The same notes rebuilt from scratch give 9 drop 3 voicings, each on its own page.
How you get to it. The turn that lands on F#madd9 is G#m7♭5 to C#7♭9: the ii and the V of F# minor, which is where a minor tonic is usually arrived at rather than simply begun on.
In which keys. Every note of F#madd9 belongs to C# minor (the iv, the subdominant), E major (the ii, the supertonic), F# minor (the i, the tonic) and A major (the vi, the submediant).
Every note of F#madd9 is in F# dorian, F# natural minor, F# harmonic minor and F# melodic minor.
Change one note of F#madd9 and you have F#m (drop the ninth), F#sus2 (drop the minor third), F#sus2sus4 (the minor third becomes a fourth), F#m6 (the ninth becomes a sixth), F#m69 (add the sixth) or F#m7 (the ninth becomes a flat seventh).
F#madd9 is a minor chord — root, minor third, fifth. Minor chords on every root.
On F#madd9’s sound and use this page follows Robert Rawlins & Nor Eddine Bahha, Jazzology (Hal Leonard, 2005). The shapes and the derived voicings come from different places, and both are explained in where the chords and the theory come from.
Shows each chord the way this style would voice it, and marks which of its alternatives belong to the idiom.